How to check if the viewer is initialized complete?

[GoogleCodeExporter]

Hi all,

I would like to ask if there are any ways to check if the viewer is initialized 
complete after the first viewer.init() and update() call.

Since it seems to be async functions, so if I want to change object/texture 
before it is loaded complete errors occur. Are there any callbacks or checking 
to check if the canvas is inited as is ready?

Original issue reported on code.google.com by [email protected] on 17 Dec 2013 at 8:37